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Oxidation resistant treatment for metallic medical devices

a technology for metallic medical devices and treatment methods, applied in the direction of prosthesis, furnaces, impression caps, etc., can solve the problems of residual chemical impurities on the treated device, and achieve the effect of efficient passivating a metallic medical device, reducing or eliminating the possibility of residual chemical impurities

Inactive Publication Date: 2005-02-03
MEDTRONIC VASCULAR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007] The oxidation treatment described herein is capable of efficiently passivating a metallic medical device thereby improving the corrosion resistance of the treated device. In addition, the oxidation treatment disclosed herein reduces or eliminates the possibility of residual chemical impurities remaining on the treated device as a result of the passivating procedure.

Problems solved by technology

In addition, the oxidation treatment disclosed herein reduces or eliminates the possibility of residual chemical impurities remaining on the treated device as a result of the passivating procedure.

Method used

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  • Oxidation resistant treatment for metallic medical devices
  • Oxidation resistant treatment for metallic medical devices
  • Oxidation resistant treatment for metallic medical devices

Examples

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example 1

[0024] Seven stainless steel S670 stents manufactured by Medtronic AVE were washed for three minutes within an ultrasound bath containing 99% isopropyl alcohol (IPA). Thereafter, the seven stents were removed from the IPA bath and dried within a gaseous flow of nitrogen.

[0025] Once dried, the scents were number 1 through 7. Sample number 1 was left untreated. Sample numbers 2 through 7 underwent passivation using the oxidation treatment disclosed herein. A corona discharge device included an electrode was positioned within an oxygen environment. Approximately 18 kV of direct current electrical energy was applied to the electrode, thereby ionizing the oxygen proximate to the electrode and resulting in the creation of a ionizing plasma. As Table 1 shows, sample numbers 2-7 were exposed to a plasma created from a corona discharge device for varying lengths of times.

TABLE 1SAMPLE NO.CORONA EXPOSURE TIME1 0 sec (control)2 5 sec.310 sec.420 sec.520 sec. (Dwell)660 mm. (Dwell)795 mm. (D...

example 2

[0028] Eight stainless steel S670 stents manufactured by Medtronic AVE were washed for three minutes within an ultrasound bath containing 99% isopropyl alcohol (IPA). Thereafter, the eight stents were removed from the IPA bath and dried within a gaseous flow of Nitrogen.

[0029] Once dried, the stents were number 1 through 8. Sample numbers 6-8 were left untreated. Sample numbers 1 through 5 underwent passivation using the oxidation treatment disclosed within. A corona discharge device included an electrode was positioned within an oxygen environment. Approximately 18 kV of direct current electrical energy was applied to the electrode, thereby ionizing the oxygen proximate to the electrode and resulting in the creation of a ionizing plasma. As Table 1 shows, sample numbers 1-5 were exposed to the plasma created from a corona discharge device for varying lengths of times between 5 seconds and 10 seconds.

TABLE 3SAMPLE NO.CORONA EXPOSURE TIME15-10 sec.25-10 sec.35-10 sec.45-10 sec.55-...

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Abstract

A method of treating a metallic medical device is disclosed and includes providing a metallic medical device, ionizing the media surrounding at least one electrode to produce an energized plasma proximate to the electrode, and exposing the metallic device to the plasma prior to use of the metallic device. In one embodiment a vascular stent is the medical device.

Description

RELATED APPLICATIONS [0001] The present application claims priority to U.S. provisional patent application Ser. No. 60 / 460,365 filed Apr. 3, 2003 the entire contents of which are incorporated herein by reference.FIELD OF THE INVENTION [0002] The present invention relates to a process for passivating a metallic surface. Specifically, an oxidation treatment is described herein is capable of efficiently passivating a metallic medical device thereby improving the corrosion resistance of the treated device. In one embodiment of the present invention the medical device is a vascular stent. BACKGROUND OF THE INVENTION [0003] Devices manufactured from at least one metallic material are commonly implanted within the body of patient to treat a variety of conditions. For example, stents, shunts, or other mechanical scaffoldings may be inserted into an occluded region of a lumen or luminal structure to provide and maintain patency therethrough. In an alternate embodiment, metallic screws, brace...

Claims

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Application Information

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IPC IPC(8): A61K6/04A61L2/14A61L27/04A61L27/30A61L31/02A61L31/08C22F3/02
CPCA61L2/14A61L27/042A61L31/088A61L31/022A61L27/306
Inventor CHEN, CHENG-HAN
Owner MEDTRONIC VASCULAR INC
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